View from above: looking down on Arecibo's big dish.

Arecibo telescope receiver platform crashes onto dish

The telescope has been inoperable since August, when a major cable broke. In November, a second cable broke and multiple engineering companies declared that safety in and around the telescope could not be guaranteed. Now astronomers’ fears for Arecibo have come to pass. No one was injured.

Seeing things that aren’t there? It’s called pareidolia

Seeing a dragon in a patch of clouds or a face on the moon, are examples of what’s called pareidolia. Take a look at these photos to test your own abilities to recognize patterns.

To reduce chances of spreading coronavirus, keep indoor air clean

Being indoors with other people is a recipe for spreading the coronavirus. But removing airborne particles through proper ventilation and air filtration can reduce some of that risk.

Epidemiologist explains CDC guidance on 15 minutes of exposure

New guidance from the CDC says that 15 minutes of exposure – regardless of whether that occurs at one time – can result in transmission of the coronavirus.

Will SpaceX’s Starlink satellites ruin stargazing?

SpaceX’s satellites will populate the night sky, affecting how we observe the stars. And this is just the beginning of private satellite mega-constellations.

Photos of 2020’s Leonid meteor shower

EarthSky Community members around the world are sharing their photos of this year’s Leonid meteor shower. Beautiful! Thanks to all who contributed.

Arecibo radio telescope, a large dish-type telescope built into a natural depression in the landscape in Puerto Rico.

NSF says Arecibo telescope will be dismantled

Heartbreaking news. After 57 years as a world-class resource for astronomy, the iconic Arecibo telescope is to be decommissioned, or withdrawn from service, the NSF announced today. The dish-type radio telescope – built into a natural depression in the landscape in Puerto Rico – appears to be headed for a “controlled disassembly.”

A photo showing cable damage at Arecibo Observatory.

A statement on Arecibo Observatory’s engineering options

Worrisome news regarding broken cables and engineering options at Arecibo Observatory, the iconic big radio dish in Puerto Rico.

Diwali 2020 shone in this ashram, despite Covid-19

Images of Diwali 2020 from an ashram in India.

A year with 13 Friday the 13ths?

Should we ever adopt the International Fixed Calendar, we’d have 13 months in a year, with each month containing a Friday the 13th. Friggatriskaidekaphobia – aka fear of Friday the 13th – would be rampant! Or not. Read more about this calendar system here.

A man in a suit, standing under a NASA logo, and in front of a machine assembly.

Bridenstine to step down as NASA administrator

Jim Bridenstine is leaving the post of NASA chief administrator.

2020’s second Friday the 13th is this Friday

November 13, 2020, will be the second of 2020’s two Friday the 13ths. This Friday the 13th comes exactly 39 weeks – that is, the number 3 multiplied by the number 13 – before the next Friday the 13th on August 13, 2021. Whee!

Clovis made stone tools for only around 300 years

The Clovis, some of North America’s earliest inhabitants, only made stone tools during a brief 300-year period from 13,050 to 12,750 years ago, new research shows.

The upper torso and hand (holding a pen) of a person thinking and writing.

What is the Common Era?

If you encounter a date in the CE (Common Era) or BCE (Before Common Era) format, don’t fret. They mean exactly the same thing as AD (anno Domini) and BC (before Christ).

NASA re-establishes contact with Voyager 2 spacecraft

On October 29, NASA re-established contact with its Voyager 2 spacecraft, after the probe was left flying solo for 7 months while repairs were made to the radio antenna in Australia used to control it.

Pumpkins with stars and a comet.

Halloween is a cross-quarter day

The 4 cross-quarter days fall between equinoxes and solstices. Halloween is the spookiest one – derived from a sacred festival of ancient Celts and Druids – coming as days grow short and nights long in the Northern Hemisphere.

Covid-19 will probably become endemic. Here’s what that means

Rather than completely disappear – even when vaccines become available- it’s likely that the coronavirus SARS-CoV-2 will be added to the family of infectious diseases known as “endemic” in the human population.

Top 10 tips for meteor-watchers

How to watch a meteor shower. Tips for beginners.

How to see anticrepuscular rays

Next time you see crepuscular rays – sunrays – at sunrise or sunset, turn around.

A close-up image of the sun with a large flare on one portion.

A new method for predicting large solar flares

Solar storms pose risks for society, but more accurate space weather forecasts appear to be coming soon. A team of researchers in Japan has developed a physics-based method for predicting large solar flares, including powerful and potentially dangerous X-flares.